I just grabbed some natural foil version (not the prerelease) for about $7.00 apiece, these seem to be surging from the bottom up, with foils not yet 'caught up' to their nominal 2-3x value of non-foil (I would say about $18.00 in a few weeks). This seems like in-print staples-in-the-making function this way (bottom-up). Out of print cards that find new uses, especially commanders, see the foil version as much higher than the non-foil when the price starts spiking up.
Reminds me a lot of noble hierarch. I could see these are $15.00 apiece in a several months.